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From: Kevin McMurtrie
Newsgroups: sci.electronics.design
Subject: Re: Vector 2X compass module
References: <6Lcf9.248414$_91.270842@rwcrnsc51.ops.asp.att.net>
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Date: Tue, 10 Sep 2002 04:13:17 GMT
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In article <6Lcf9.248414$_91.270842@rwcrnsc51.ops.asp.att.net>,
"Hank" wrote:
>Greetings!
>
>I am in the process of designing a simple device to rotate a satellite dish
>in conjunction with the movement of a compass module. At anchor, I would
>like a satellite dish to rotate (azmuth only) in conjunction with boat
>movements.
>
>Has anyone experimented with the Vector 2X compass module interfaced with a
>stepper or servo motor to convert compass movement to shaft rotation?
>
>Precision Navigation has some general application notes for their vector 2x,
>but lacking a lot of specifics.
>
>Any help or insight would be most appreciated!
>
>Hank S.
>
>S. Florida
>
Try cycling the dish side to side a small amount. You can then use
phase detection between that motion and the signal strength to tell you
which way to move the dish for better reception. It seems like it would
be easier because it doesn't require a compass or stepper motor. It's
also immune to magnetic fields.
The only catch is that you need some power to keep the dish cycling.
The tracking speed will also depend on how fast you cycle the dish.